Deserialize json in adonis - node.js

Question

i have this two arrays of objects:
bookUnitIdInformacoes
[
{
"id": 5,
"book_id": 33,
"unit": 1,
"sequence": 1,
"description": "UNIT_01_GRAMMAR",
"qt_question": 5,
"status": false,
"user_id": 1,
"created_at": "2019-12-27 08:11:21",
"updated_at": "2019-12-30 14:54:12",
"miniature": null
},
{
"id": 6,
"book_id": 33,
"unit": 1,
"sequence": 2,
"description": "UNIT_01_VOCABULARY",
"qt_question": 5,
"status": false,
"user_id": 1,
"created_at": "2019-12-27 08:11:39",
"updated_at": "2019-12-27 08:11:39",
"miniature": null
},
{
"id": 7,
"book_id": 33,
"unit": 2,
"sequence": 1,
"description": "UNIT_02_GRAMMAR",
"qt_question": 5,
"status": false,
"user_id": 1,
"created_at": "2019-12-27 08:11:46",
"updated_at": "2019-12-27 08:11:46",
"miniature": null
},
{
"id": 8,
"book_id": 39,
"unit": 1,
"sequence": 1,
"description": "UNIT_01_GRAMMAR",
"qt_question": 5,
"status": false,
"user_id": 1,
"created_at": "2019-12-30 11:07:09",
"updated_at": "2019-12-30 15:03:50",
"miniature": null
}
]
and idioma:
[
{
"id": 13,
"code": "ING-NOT-2019",
"description": "Inglês Noturno 2019",
"start_date": "2019-12-30T03:00:00.000Z",
"end_date": "2019-12-31T03:00:00.000Z",
"period": "Noturno",
"language": "Inglês",
"status": false,
"user_id": 1,
"created_at": "2019-12-30 10:04:47",
"updated_at": "2020-01-05 16:08:00",
"language_substring": "US"
},
{
"id": 14,
"code": "ESP-MAN-2019",
"description": "Espanhol manhã 2019",
"start_date": "2019-12-30T03:00:00.000Z",
"end_date": "2019-12-31T03:00:00.000Z",
"period": "Manhã",
"language": "Espanhol",
"status": false,
"user_id": 1,
"created_at": "2019-12-30 11:06:44",
"updated_at": "2019-12-30 11:06:44",
"language_substring": null
}
]
I'm grouping the  bookUnitIdInfomacoes  by  book_id reducing the array into an object of  key => value  pairs as  book_id => array of books
Then, using [ Object.values ] to retrieve only the values of this  groupedObj  object.
Lastly, we map  idiomas  and add the corresponding book group into a new property called  quizz . For a given  idioma , we know its position in  idiomas  thanks to the second argument of  map :  i . We simply do  grouped[i]  to get the corresponding group of books.
The code:
const groupedObj = bookUnitIdInformacoes.reduce((grouped, info) => {
   grouped[info.book_id] = grouped[info.book_id] || [];
   grouped[info.book_id].push(info);
   return grouped;
 }, {});
 const grouped = Object.values(groupedObj);
 const result = idiomas.map((idioma, i) => ({
   ...idioma,
   quizz: grouped[i]
 }));
But when i do a return result i have this:
[
{
"__setters__": [
"$attributes",
"$persisted",
"primaryKeyValue",
"$originalAttributes",
"$relations",
"$sideLoaded",
"$parent",
"$frozen",
"$visible",
"$hidden"
],
"$attributes": {
"id": 2,
"code": "ING-NOT-2019",
"description": "Inglês Noturno 2019",
"start_date": "2019-12-30T03:00:00.000Z",
"end_date": "2019-12-31T03:00:00.000Z",
"period": "Noturno",
"language": "Inglês",
"status": false,
"user_id": 1,
"created_at": "2019-12-30T13:04:47.000Z",
"updated_at": "2020-01-05T19:08:00.000Z",
"language_substring": "US"
},
"$persisted": true,
"$originalAttributes": {
"id": 2,
"code": "ING-NOT-2019",
"description": "Inglês Noturno 2019",
"start_date": "2019-12-30T03:00:00.000Z",
"end_date": "2019-12-31T03:00:00.000Z",
"period": "Noturno",
"language": "Inglês",
"status": false,
"user_id": 1,
"created_at": "2019-12-30T13:04:47.000Z",
"updated_at": "2020-01-05T19:08:00.000Z",
"language_substring": "US"
},
"$relations": {},
"$sideLoaded": {},
"$parent": null,
"$frozen": false,
"quizz": [
{
"id": 1,
"book_id": 1,
"unit": 1,
"sequence": 1,
"description": "UNIT_01_GRAMMAR",
"qt_question": 5,
"status": false,
"user_id": 1,
"created_at": "2019-12-27 08:11:21",
"updated_at": "2019-12-30 14:54:12",
"miniature": null
},
{
"id": 2,
"book_id": 1,
"unit": 1,
"sequence": 2,
"description": "UNIT_01_VOCABULARY",
"qt_question": 5,
"status": false,
"user_id": 1,
"created_at": "2019-12-27 08:11:39",
"updated_at": "2019-12-27 08:11:39",
"miniature": null
},
{
"id": 3,
"book_id": 1,
"unit": 2,
"sequence": 1,
"description": "UNIT_02_GRAMMAR",
"qt_question": 5,
"status": false,
"user_id": 1,
"created_at": "2019-12-27 08:11:46",
"updated_at": "2019-12-27 08:11:46",
"miniature": null
}
]
},
{
"__setters__": [
"$attributes",
"$persisted",
"primaryKeyValue",
"$originalAttributes",
"$relations",
"$sideLoaded",
"$parent",
"$frozen",
"$visible",
"$hidden"
],
"$attributes": {
"id": 3,
"code": "ESP-MAN-2019",
"description": "Espanhol manhã 2019",
"start_date": "2019-12-30T03:00:00.000Z",
"end_date": "2019-12-31T03:00:00.000Z",
"period": "Manhã",
"language": "Espanhol",
"status": false,
"user_id": 1,
"created_at": "2019-12-30T14:06:44.000Z",
"updated_at": "2019-12-30T14:06:44.000Z",
"language_substring": null
},
"$persisted": true,
"$originalAttributes": {
"id": 3,
"code": "ESP-MAN-2019",
"description": "Espanhol manhã 2019",
"start_date": "2019-12-30T03:00:00.000Z",
"end_date": "2019-12-31T03:00:00.000Z",
"period": "Manhã",
"language": "Espanhol",
"status": false,
"user_id": 1,
"created_at": "2019-12-30T14:06:44.000Z",
"updated_at": "2019-12-30T14:06:44.000Z",
"language_substring": null
},
"$relations": {},
"$sideLoaded": {},
"$parent": null,
"$frozen": false,
"quizz": [
{
"id": 4,
"book_id": 2,
"unit": 1,
"sequence": 1,
"description": "UNIT_01_GRAMMAR",
"qt_question": 5,
"status": false,
"user_id": 1,
"created_at": "2019-12-30 11:07:09",
"updated_at": "2019-12-30 15:03:50",
"miniature": null
}
]
}
]
How i can deserialize this? JSON.stringify(result) returns the same json.

Answer 1

Try this:
const result = idiomas.map(({ $attributes }, i) => ({
...$attributes,
quizz: grouped[i]
}))